William b



.W. B. FOSTER.

vCOILED SPRING STRUCTURE.

Patented Mar. 22, 1921*.

APPLICATIION- FILED OCT. I5, 1919.

UNITED STATES PATENT OFFICE.

WILLIAM B FOS TER, OF UTIGA, NEW YORK, ASSIGNOR TO FOSTER B ROTHERS MIANU- FACTURING COMPANY, OF UTICA NE'W YORK. A CORPORATION.

COILED-SPRING STRUCTURE.

skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings,; and to the reference-numerals marked thereon, which form part of this specification. My present invention relates to spring structures. A The pupose of my invention is to pro vide a coiled spring structure of simple and improved construction and operation.

A further purpose is to provide an at. ticle of the class described wherein. the coiled springs are formed with the ends of the wire which forms the spring curved wardly from the end coils, but in the same planetherewith in order to afford a greater supporting surface for the fabric or other upholstering about the spring as well as greater supporting surface forthe person using the structure.

Another purpose is to provide this further or additional supporting member of such form. and character that it may be readily made upon the ordinary coiling machine without separate or supplemental operations upon the spring and without requiring any tying or knotting of the end.

coiled Further purposes and advantages of my invention will appear from the claims hereinafter set forth.

Figure l is a side elevation of coiled spring embodying my invention.

Fig. 2 is a top view of the same.

Fig 3 is a horizontal sectional View on line 3--3 of Fig. 1.

Fig. 4: is a top view on a reduced scale of part of a coiled sprin structure embodying my invention.

Referring to the drawings in a more particular description it will be seen that the spring comprises a main spiral portion 6 of desired height, diameter and number of coils to afford the strength and resiliency desired by the particular structure in hand.

At the top or yielding end where the spring acts only from one end or at both Specification of Letters Patent.

Patented Mar. 22. 1921.

Application filed November 15. 19 19. Serial No. 338,277.

ends when the spring is to be used in a structure where both ends are to be yielding orsupporting ends there is provided an. end. coil? ma plane at right angles to the axis of the spring as a whole. Preferably also this end coil 7 will be of. larger diameter than themain or spiral portion 6.

After making the more or lesscompletc circle of the end coil 7 the wire of which the spring is formed is bent inwardly or curved inwardly on a curve of less size than the coils therebelow so as to provide an.

end-piece 8 reaching to about the center or a little past the center as plainly suggested in the drawings. This end-piece Sis in substantially the same plane as its end coil '7 and. i so ob\*1ous1y affords a further or supplemental supporting'surface for that endof the.

spring in addition to the end coil 7. It will be seen that in this way the fabric, cushion or other moholsteiing material over the springs will be supported very considerably withinthe circle of the coiled spring and withiln the circle of the end coil 7 thereof and thus prevented from working down spring or from the subjacent end coil in the sense that the end-piece 8 comes in past the subjacent portion 9 of the spring and rests thereupon but is not tied thereto in any form. In this way the spring is kept more resilient and free from knobs on its ends and especially may be made complete by the ordinary coiling machine without the spring having to be subjected to further separate or special operations as would be the case where the inturned end was given a sharp or decided angle or in any way tied to the subjacent coil of the spring.

The inwardly extending end-piece 8 is obviously of such length shape and position that it cannot under any ordinary usage of the spring be forced off from its rest on the subjacent part 9 of the spring nor will the projected be- What I claim as new and desire to secure by Letters Patent is: V

l. A coiled spring for spring cushion structures-comprislng a main spiral portion,

a fiat coil at the yielding end of the spring and in a plane substantially at right angles to the axis of the spring and a free end piece curving. inwardly from said end coil to about the center thereof and in the same plane therewith, the outer portion of said free end-piece beginning outside the sub jacent part of the spring and passing in over and resting upon the said subjacent 7 part of the spring at an angle.

2. A coiled spring for spring cushioned structures compris ng a main spiral portion,

a list coilat the yielding end of the spring and in a plane substantially at rightangles i to'the axis of ,the spring and a free endpiece curving inwardly from said endcoil ;to about the center thereof and in the same plane therewith, the outer portion of said free end-piece beginning outside the subjecent'part of the spring and passing in over and resting upon the said subjacent part of the spring at an angle sufiicient to prevent the two engaged portions of the spring from V slidin or rolling on each other.

3. coiled spring for spring cushion ginning outside the adjacent part of the I spring and passing inward by the adjacent part of the spring and resting thereagainst.

4. A. coiled spring for spring cushion structures comprising a main spiral portion a flat coil at the yielding end of the spring,

larger than the spiral portion and in a plane substantially at right angles to the axis of the spring and a free end-piece curving inwardly from said end coil to about the center thereof and in the same plane therewith, the outer portion of said free end-piece beginning outside the adj acent part of the spring and. passing in over and resting upon the said subjacent part of the spring.

5. A coiled spring for spring cushion structures comprisin a main central spiral portion, flat end coils in planes substantiall at right angles to the axis of the spring and larger than said central spiral portion, tree end-pieces curring inwardly from said end coils to about the center thereof and in the same planes respectively therewith, the outer portion of each of said end-pieces beginning outside the adjacent part of the spring and passing inward by the adjacent part of the spring and resting thcreagainst.

In witness whereof I have afiixed my signature, this first day of Novenibcn 1919.

WILLIAM B. FOSTER. 

